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JEE Mains · Maths · STD 11 - 9. straight line

यदि दो रेखायें \(x +( a -1) y =1\) तथा \(2 x + a ^{2} y =1( a \in R -\{0,1\})\) लंबवत् हैं, तो उनके प्रतिच्छेदन बिन्दु की मूल बिन्दु से दूरी है 

  1. A \(\frac{2}{5}\)
  2. B \(\frac{{\sqrt 2 }}{5}\)
  3. C \(\frac{2}{{\sqrt 5 }}\)
  4. D \(\sqrt {\frac{2}{5}} \)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\sqrt {\frac{2}{5}} \)

Step-by-step Solution

Detailed explanation

Two lines are perpendicular \(\therefore {m_1}{m_2} = - 1\) \( \Rightarrow \left( {\frac{{ - 1}}{{a - 1}}} \right)\left( {\frac{{ - 2}}{{{a^2}}}} \right) = - 1\) \( \Rightarrow {a^3} - {a^2} + 2 = 0\) \( \Rightarrow \left( {a + 1} \right)\left( {{a^2} - 2a + 2} \right) = 0\)…
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